Incoherent transport induced by a single static impurity in a Heisenberg chain

Details Incoherent transport induced by a single static impurity in a Heisenberg chain Incoherent transport induced by a single static impurity in a Heisenberg chain

2009-01-28

arxiv.org/abs/0901.4487v1

Phys. Rev. B 80, 125118 (2009).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.80.125118

The effect of a single static impurity on the many-body states and on the spin and thermal transport in the one-dimensional anisotropic Heisenberg chain at finite temperatures is studied. Whereas the pure Heisenberg model reveals Poisson level statistics and dissipationless transport due to integrability, we show using the numerical approach that a single impurity induces Wigner-Dyson level statistics and at high enough temperature incoherent transport within the chain, whereby the relaxation time and d.c. conductivity scale linearly with length.

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